Wing Gateway is a shareware, you can evaluate it free of charge for 15 days. After 15 days, if you want to continue using it, you need to purchase a license through our website:
https://www.wftpserver.com/ordergateway.htm
The registration key will be sent to you via email within 12 hours after you place your order, please make sure your SMTP server won't block our email address: support@wftpserver.com
To register Wing Gateway, you need to open WingFTP's web admin, then navigate to "Server -> Settings -> Gateway Manager -> Select the gateway":
And then click on the button "Register Wing Gateway" (you can also use this button to view the gateway status):
Input the license key and click on the button "Register":